Dear sir the problem you have sounds like the solenoid that opens the drain actuater can be worn out open the bottom panel run tru a cycle observe when the solenoid open it may be that there is something causing the solenoid to buzz either worn out or a wire or something in the way causing not to close proprly thanks from gilles

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Many Frigidaire
dishwashers come with the promise of being the "quietest dishwasher in
its class," according to Frigidaire. However, a quiet dishwasher doesn't
necessarily mean that the dishwasher is silent, as some noises are
normal. It can take some troubleshooting at times to determine if a
noise coming from the dishwasher is typical or if it indicates a larger
problem
Listen for the sound of water filling and draining throughout the washcycle. These sounds are normal and do not indicate an issue.

2
Pay attention to the drain
motor, which operates at the beginning of each cycle. This noise should
be fairly quiet and should not sound like a loud, grinding or banging
sound.

3
Note that the sound will change
when the wash cycle moves between the lower and middle spray arms. This
sound should be temporary and fairly quiet.

4
Look for hard items in the dishwasher
grinder or filter if a loud crunching, buzzing or grinding sound is
heard. The dishwasher can typically grind up these items within one or
two cycles, but the item may be lifted out and discarded to eliminate
the sound.

5
Remove the bottom rack and spray
arms from the bottom of the dishwasher if there is a loud noise coming
from the dishwasher that does not resolve itself. Look inside for the
impeller, which is round and spins. Remove any debris that may be
clogging up the impeller or pump.

The motor is stuck. If you remove the lower cover and see a square aluminum motor it is less than 7 years old. Make sure power is off at breaker and rotate the motor shaftby turning the fins inside the motor. If the motor is black and round you have to turn the fan blade which is located in a slot between the metal pump and the plasticpump. Also once freed, a light shot of silicone or WD-40 (silicone works better) at thebearing ends. Also check pump for leaks around the drain solenoid (shiny shaft attached to a plastic triangle). If it's leaking during pumpout, the seal has failed. The pump runsaround 100 dollars typically. Hope this helps.

Check the stainless steel cover on the bottom of the lower rack sprayer. If it has been bent downward on either end, it will hit the inside panel of the door near the bottom. It may score the panel as it hits on each rotation of the sprayer.

Just bend it back in position, carefully, with a pair of pliers. The technique required is similar to bending the pocket clip of a fountain pen back into the proper position after it has been sprung out too far. You might practice on a pen or mechanical pencil clip to see what I mean.

I believe this is a brand new dishwasher. Please listen carefully to determine of the sound you hear (clunk) is being made inside the dishwasher or is it being made near by. Most times, the problem is that the hot water pipe is baking the noise when the dishwasher closes the water inlet valve ... and the pipe goes "clunk"
I have not had an LG dishwasher make a clunking sound inside itself when the cycle changes. Also, because this dishwasher is so very quiet (well insulated) the pipe banging would be louder than something inside the Dishwasher.
If you have access to the hot water pipe, listen very near it when the cycle changes for the sound. Follow that pipe (hot water) pipe back and insulate it at the point it is banging. (or get a plumber to evaluate and resolve.)
Please get back to me with what you find, OK?
Good Luck!

if you have a torx 20, and torx 15 screw driver, you an remove the screws from the top plate of the wash motor, and underthere youll see another t15 screw converingthe "chopper" assy, sounds as if a seed, of chicken bone, perhaps apiece of glass hasgottne down there

How deep do you want to get into this?It sounds like the wash pump motor bearings that are worn.You can pull the unit out flip it over and wd40 the bearings in the motor or you can replace the bearings.Try to lube them first.

At the beginning of the cycle the dishwasher is attempting to pump out any residue water in the waste pipe and sump. It could be that the motor is sticking but you would probably also suffer from it not draining properly.
It may just be noisy pump. I have a similar model and it is also quite noisy but nothing extraordinary.
When the dishwasher is pumping out at the end of the washing cycle it may be quieter when there is water in the pump/pipes but then gets noisy as it 'pumps air'.